In the field of HVDC power converters there is a need for an improved semiconductor switching assembly which obviates the difficulties associated with main semiconductor switching elements having inherent limitations in their performance. A semiconductor switching assembly (10; 110) comprises a main semiconductor switching element (12, 112) that includes first and second connection terminals (14, 16) between which an active auxiliary circuit (20) is electrically connected. The auxiliary circuit (20) includes an auxiliary semiconductor switching element (22; 32; 38; 40; 42) and current capture element (24) that are connected in series with one another. The auxiliary semiconductor switching element (22; 32; 38; 40; 42) has a control unit (26; 126) operatively connected therewith. The control unit (26, 126) is configured to switch on the auxiliary semiconductor switching element (22; 32; 38; 40; 42) to divert into the current capture element (24) a reverse recovery current (IRR1, IRRn) that flows through the main semiconductor switching element (12; 112) while it turns off.
|Publication status||Published - 17 Dec 2015|
- HVDC power converters
- semiconductor switching assembly